... with an electric stoker engine attached:
From afar, and my real world experience with shopping bag panniers on a regular bike, I make it to be about 3 times the cargo capacity, or more. Utsukushikereba sore de ii
you are the media you consume.
Sorry, left out the links:
Xtracycle's Sports Utility Bike
CleverChimp's Stoke Monkey Utsukushikereba sore de ii